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Marquise|Natural|GIA

1.20ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 5241088647

Certificate GIA 5241088647

Diamond specifications and retailer prices

From £3,234 GBP
As of November 5, 2026
Save £3,267 GBP (50%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £6,501 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1.2ct natural marquise diamond

This 1.2ct natural marquise sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 5241088647. Listed at 13 retailers as of November 4, 2026, with prices from £3,234 to £6,501, a £3,267 spread on the same certified stone. MOH London lists it at £6,501. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.20
Carat
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 5241088647
Dimensions10.42 × 5.34 × 3.39 mm
L/W Ratio1.95
Girdle conditionFaceted
Culet sizeNone
Top View
10.42 mm5.34 mm1.20 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 5241088647
Side View
Table 61.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 63.5%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £6,501 GBP|Low: £3,234 GBP|High: £6,501 GBP|Avg: £4,198 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 6, 2026
Retailer 11£3,234 GBP
Retailer 12£3,451 GBP
Retailer 10£3,489 GBP
Retailer 9£3,902 GBP
Retailer 13£3,925 GBP
Retailer 7£3,954 GBP
Retailer 2£3,970 GBP
Retailer 6£3,975 GBP
Retailer 3£4,154 GBP
Retailer 4£4,154 GBP
Retailer 5£4,296 GBP
Retailer 8£4,994 GBP
MOH London£6,501 GBP

3 data points across 13 retailers

13 retailers£3,234 GBP to £6,501 GBP

B+
Cheapest Retailer
-
£3,234 GBP
B+
Retailer 2
-
£3,451 GBP
View
B
Retailer 3
-
£3,489 GBP
View
B
Retailer 4
-
£3,902 GBP
View
B
Retailer 5
-
£3,925 GBP
View
B
Retailer 6
-
£3,954 GBP
View
B
Retailer 7
-
£3,970 GBP
View
B
Retailer 8
-
£3,975 GBP
View
B
Retailer 9
-
£4,154 GBP
View
B
Retailer 10
-
£4,154 GBP
View
B
Retailer 11
-
£4,296 GBP
View
B
Retailer 12
-
£4,994 GBP
View
Most Expensive
B
MOH London
BE1C044CB · Nov 4
£6,501 GBP
View
12 more retailers have this diamond
Prices start from £3,234 GBPSave up to £3,267 GBP

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

B+
1.20ct Marquise
£3,234 GBP